passing multiple selected checkbox values in query string to another page ?

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C#

VB

ASP.NET

i have used a gridview and checkbox to select the items in the gridview....I can select the values easily...when i am selecting one row at a time then using query string i can easily pass the id of the selected row but when i am selecting multiple rows in the field,i dont know how to pass the array of integers[i.e id value to another field]

Protected Sub Gridparent_SelectedIndexChanged(sender As Object, e As System.EventArgs) Handles Gridparent.SelectedIndexChanged
    
    If Gridparent.Rows.Count > 0 Then

        For Each gvrow As GridViewRow In Gridparent.Rows
            Dim chk As CheckBox = DirectCast(row.FindControl("CheckBox2"), CheckBox)
            If chk.Checked = True Then
                Dim gid As String = DirectCast(gvrow.FindControl("lbtrans"), Label).Text
                HiddenField1.Value = gid
            End If
        Next
    End If

then at another gridview rowdatabound event where i am passing the query string i am using this code :

Dim transid As String = HiddenField1.Value
Dim wempid As String = HiddenField3.Value
Dim hyperLink = TryCast(e.Row.FindControl("HyperLink1"), HyperLink)
If hyperLink IsNot Nothing Then
    If HiddenField7.Value = 0 Then
        hyperLink.NavigateUrl = "Leaveauth.aspx?wempno=" & Request.QueryString("wempno") & "&transid=" & transid & "&wempid=" & wempid & "&keyd=" & keyd & ""
        hyperLink.Attributes.Add("class", "fancybox")
        HiddenField7.Value = 1
    Else
        'hyperLink.NavigateUrl = "#"
    End If
End If